On-Line Analytical Processing, a class of systems designed for fast calculation, reporting and analysis of aggregate figures.

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2answers
46 views

Are indexes unnecessary for columnar database?

In a columnar database, are indexes unnecessary or useless?
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0answers
35 views

date dimension OLAP cube design

I have a sales reporting system with incoming data like this date,editionID,outletId,Measure1,Measure2 2013-01-01,2,532,11,24 etc... I am new to designing data cubes (for the pentaho BI suite) and ...
2
votes
1answer
171 views

Dealing with measure groups of different granularity

Let's say I have a simple data warehouse with the following fact tables: FactPurchase: one row per property purchased, with purchase amount, value, etc. FactMonthlyStatus: one row per property, per ...
0
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0answers
16 views

Many people, one event, multiple factors - OLAP

Have a modeling problem here... first the back-story... We deal with accident data on our project, 1 vehicle-crash can have multiple people and vehicles involved, and many associated factors across ...
0
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1answer
278 views

Benefits of using Staging Database while designing Data Warehouse [closed]

I am in process of designing a Data Warehouse Architecture. While exploring various options to Extract data from Production and putting into Data Warehouse, I came across many articles which mainly ...
1
vote
1answer
374 views

Datawarehouse - Dimension, Fact, or Degenerative dimension

I am building a warehouse for a billing system that bills a number of services/utilities on the same invoice, as such I am having real trouble conforming to a recognised design method for the ...
1
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0answers
51 views

how declaring `hierarchies and level` in SSAS help to improve MDX Query performance?

how declaring hierarchies and level in SSAS help to improve MDX Query performance? I use SQL Server 2008 R2 and I use SSAS and I reading book Professional Microsoft SQL Server Analysis Services 2008 ...
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0answers
160 views

how i can auto format mdx query in sql server [closed]

I Use SQL Server 2008 R2 And SSAS. I write/edit MDX Query and in some case complex i need format my MDX Query like Key (Ctrl+K)(Ctrl+Y) in SQL Tools Belt. after very search i find this site ...
1
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0answers
105 views

Need to write MDX for time dimension in Mondrian

This is my Dimesion and Measure: <Dimension type="TimeDimension" foreignKey="ReqDateKey" name="Date"> <Hierarchy name="YQMD" hasAll="true" allMemberName="All Dates" ...
2
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0answers
139 views

Geographic Hierarchies in a OLAP Cube / Data Warehouse

Are the following geographic hierarchies correct? Do any US/Canadian area codes cross state/province lines? Do any US/Canadian counties cross state/province lines? Are there countries with counties ...
2
votes
2answers
637 views

Transferring Data from OLTP to OLAP databases

Systems that have both OLTP and OLAP databases periodically move data from the OLTP database to the OLAP database, so that reports can be generated based on the OLAP database. What's the official ...
10
votes
3answers
474 views

Is backing a website by a SQL Server 2012 OLAP cube considered reasonable?

I have been tasked with architecting a solution for a large retail chain. They want to allow each of its 1.2 million customers to log on to a web site to see the distribution of recent purchases ...
4
votes
1answer
215 views

How to handle “many columns” in OLAP RDBMS

I have a fact that has around 1K different numerical attributes (i.e. columns). I would like to store this in to a column-oriented DB and perform cube analysis on it. I tried to design a star ...
3
votes
1answer
211 views

Should I snowflake or duplicate it across my facts?

I'm building up a data warehouse to be used by SSAS to create cubes on, and I'm debating between two possible schemas. In my warehouse, I've got two different fact tables that tracking daily changes ...
6
votes
2answers
373 views

SSIS Validation slow. OLTP OLAP running on same server

I have four identical servers 2 are used in production and the other two are demo machines/emergency fail over boxes. The more powerful machine a 16 core 127 gigs of Ram hosts both our Datawarehouse ...
0
votes
1answer
99 views

Is it possible to drop data from OLAP database (and to keep definitions)?

[SQL Server Analysis Services from MS SQL Server 2008 R2 Standard] Our OLAP DB takes data from OLTP DB. We want to make some changes to its structure and to do this - it would be helpful if we could ...
1
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0answers
64 views

How to calculate run-off triangles?

(Note: This is copy of my question on StackOverflow here.) Reality description: We do have a list of projects. In every project there is a lot of accounts. You can do a lot of actions on every ...
0
votes
1answer
224 views

Storing 5TB web server access log vs OLAP DB

We have over 5TB compressed web server log in a HDFS and we often analyse using Hadoop. It is painful to run map reduce on 5TB of data and most importantly, not many developer are familiar with it. ...
4
votes
1answer
481 views

How do I display subtotals in cube browser in SSAS 2012 (Sql Server Data Tools)?

Apparently this feature was available in previous versions but has now been removed. What are some alternatives?
2
votes
0answers
165 views

Semi-additive measures for other dimensions

I am looking for a way to do semi-additive aggregations on a non-time dimension. The model I am working with is similar to a snapshot inventory warehouse. Specifically I am analyzing processes ...
1
vote
0answers
141 views

ETL import more dimensions from only 1 column

I was requested at work to learn ETL. I have already created a database without using ETL with some dimensions and consolidations, etc, containing above 1 billion numerical values. Now I have to ...
1
vote
3answers
647 views

Oracle OLAP option

I'm considering giving a try to the Oracle OLAP option. Can anyone share their experiences with it? I didn't find much discussion/blog activity on the subject. In particular, I'm interested in ...
1
vote
1answer
485 views

SSAS Modelling - many to many with one dimension

I'm having bit of a hard time modelling an OLAP cube. My analogy is this: I have a list of students. Each one has one Major subject of study, and zero or more minors, up to five in total. The raw ...
3
votes
3answers
373 views

Handling attributes that are time-variant in a Datamart

I have looked through the entire list of sites, and this is I think the best match. This is not really about database administration, more like database design. Please excuse me and point me to the ...
7
votes
3answers
752 views

What advantages does in-memory OLAP have over traditional systems with significant memory?

Do in-memory OLAP engines have advantages over the traditional OLAP engines backed by enough RAM to contain the entire cube(s)? For example, if I use a MOLAP engine (SSAS) and GB / TB of RAM where ...
3
votes
1answer
182 views

Connect tables in a cube based on historical data

So this may be the wrong place, and may seem pretty basic, but I'm new to building up cubes, so please forgive me. Imagine a setup described by the following: CREATE TABLE [dbo].[Orders] ( ...
5
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1answer
197 views

How to report on sparse areas of sparse fact table

A source system tracks student attendance for a school district by reporting absence events. Attendance on any particular day can be determined by examining three datasets: school calendar, student ...
6
votes
1answer
1k views

Medians, Modes, Percentiles and OLAP

I'm newbie trying to wrap my head around OLAP, and I have a few questions. Question 1: Can an OLAP cube store medians, modes, percentiles? Question 2: Can an user-written MDX query return a summary ...
2
votes
3answers
933 views

How does an OLAP cube database differ from an RDBMS?

Is a cube database, simply an RDBMS—such as PostgreSQL or MySQL—configured for OLAP via a star or snowflake schema? Or is a cube database different from an RDBMS, and if so how?
2
votes
2answers
285 views

OLAP Cube Database - need a to find a consultant / alternative to cognos express

I have a client that has about 10 staff. They want to add business intelligence services to an existing mysql relational database. It is a database containing purchasing and readership data for ...
1
vote
1answer
750 views

Design of fact table(s) and dimensions tables for data warehouse

Hi i'm newbie in Datawarehousing, how would you model this in a Data Warehouse: i wish design the Data Warehouse which give the answers of statistics relating to a baseball league For players in ...
3
votes
2answers
486 views

Combining retail sales and payment OLAP cubes

I'm using SQL Server 2005 Standard Edition Analysis Services (SSAS). I'm trying to build cubes from a retail OLTP database that can answer these kinds of questions: List down all products that were ...